The invisibility cloak can make something invisible by wrapping ______. What does it mean by "researchers painstakingly tuned t

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问题 The invisibility cloak can make something invisible by wrapping ______.
What does it mean by "researchers painstakingly tuned the design..."?(Para. 5)

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答案Researchers adjusted the design with great efforts.

解析 由题干定位到文章第5段第4句To make it work,researchers painstakingly tuned the design of the cloak’s metamaterial parts...tune作动词有“调音”之意,另外还表示“调整(机器等使之运转正常)”,因此可以用adjust来解释。从上下文判断,隐形斗篷不可能一次试验成功,必须付出很多努力反复修改设计使之更好发挥作用,因此应围绕此意回答。
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